Ingredient · Active
Niacinamide: What It Does for Skin
Also known as: Vitamin B3, Nicotinamide
Niacinamide is one of the few actives that is genuinely easy to add to a routine. It works on several fronts at once — oil regulation, barrier support, and redness — and it irritates far less than acids or retinoids. If you are building a first routine and want one treatment step that is hard to get wrong, this is usually it.
What niacinamide is
Niacinamide is a form of vitamin B3. In skincare it is used as a water-soluble active, typically in a serum or lotion at concentrations between 2% and 10%.
Unlike acids or retinoids, it does not exfoliate or accelerate cell turnover. It works by supporting processes the skin already runs — which is why it rarely causes the irritation that stronger actives do.
What it does
- Helps regulate sebum production, which is why it appears in routines for oily and combination skin.
- Supports the skin barrier by encouraging the skin's own production of ceramides, reducing water loss.
- Reduces the look of redness and blotchiness, making it a common choice for rosacea-prone skin.
- Helps fade post-inflammatory hyperpigmentation — the marks left behind after a spot clears.
- Makes pores look smaller over time, mostly by reducing the oil and congestion that stretch them.
What concentration to look for
Most of the benefits are well covered between 4% and 5%. Products at 10% exist and are popular, but going higher does not scale the results linearly, and some people find 10% causes flushing or a mild tingle.
If your skin is sensitive or reactive, start at 5% or below. There is little to gain from pushing the number up.
How to use it
- Apply to clean skin before heavier creams — serum first, moisturiser after.
- Morning, evening, or both. It is stable and does not increase sun sensitivity.
- It layers comfortably under sunscreen, which makes it an easy addition to a morning routine.
- Give it eight to twelve weeks before judging its effect on pigmentation or pore appearance.
The vitamin C question
You will still see advice that niacinamide and vitamin C cancel each other out, or combine to form nicotinic acid and cause flushing. This comes from decades-old research done at high temperatures on raw ingredients, not on finished formulations.
In modern, properly formulated products the two are used together routinely, and several brands sell them in a single bottle. If you find the combination stings, separate them — one in the morning, one at night — but you do not need to avoid it on principle.
Pairs well with
- Hyaluronic acid — hydration alongside oil regulation
- Ceramides — both support the barrier
- Salicylic acid — niacinamide offsets some of the dryness
- Sunscreen — no interaction, and pigmentation work needs SPF
Use with care alongside
- Strong acid peels — introduce separately so you can tell what caused what
- High-strength retinoids, if your skin is already irritated
Common questions
Can I use niacinamide every day?
Yes. It is one of the few actives most people can use twice daily without a tolerance-building period. If you notice flushing, drop to once a day or switch to a lower concentration.
Does niacinamide help with acne?
It helps with two things that contribute to acne — excess oil and inflammation — and it fades the marks left behind. It is not a substitute for a dedicated acne treatment like salicylic acid or a retinoid, but it works well alongside them.
How long does niacinamide take to work?
Oiliness and redness often improve within four weeks. Pigmentation and pore appearance take longer — plan on eight to twelve weeks of consistent use.
Is 10% niacinamide better than 5%?
Not meaningfully, for most people. The commonly cited benefits are covered well below 10%, and higher concentrations are more likely to cause flushing in sensitive skin.
Not sure if niacinamide is right for your skin?
A scan grades what your skin actually needs and builds the routine around it — including which actives to use together and which to keep apart.